Drag factor is best described as:

Drag factor is best described as:

• A. Surface's ability to stop an object
• B. This is also the friction between tires and the roadway
• C. Both of the above
• D. Neither of the above

Answer: (C)

Drag factor is all about the friction available between the tires and the road that resists motion. This friction is what gives a vehicle the ability to stop, so describing the surface’s ability to stop an object captures the general idea of how much grip the surface can provide. At the same time, drag factor is specifically the friction between tires and the roadway—the mechanism that produces braking force. Because it reflects how well the road surface and tires interact to slow or stop a vehicle, both descriptions fit. In practice, higher drag factor (more grip) means shorter stopping distances, while lower drag factor means longer stops, which is why road conditions and tire condition are crucial to braking performance.

Drag factor is all about the friction available between the tires and the road that resists motion. This friction is what gives a vehicle the ability to stop, so describing the surface’s ability to stop an object captures the general idea of how much grip the surface can provide. At the same time, drag factor is specifically the friction between tires and the roadway—the mechanism that produces braking force. Because it reflects how well the road surface and tires interact to slow or stop a vehicle, both descriptions fit. In practice, higher drag factor (more grip) means shorter stopping distances, while lower drag factor means longer stops, which is why road conditions and tire condition are crucial to braking performance.